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Effect of nitric oxide donation on mucin production in vitro
1Department of Otorhinolaryngology Head and Neck Surgery, Queen's Medical Centre, University Hospital, Nottingham, UK. ruth.capper@virgin.net
Abstract:
Otitis media with effusion (OME) is characterized by the accumulation of a viscous fluid rich in mucins in the middle ear cleft. There is increasing evidence that this fluid is the result of an inflammatory reaction and that nitric oxide (NO) is an important mediator in this reaction. The goblet cell line HT29-MTX produces principally MUC5AC, an important mucin in middle ear effusions, and thus is a good model for the study of mucus-secreting epithelia. Confluent cell cultures were trypsinized, subcultured and incubated with isosorbide dinitrate (ISDN), a NO donor, for 0.5, 1 and 2 h at a concentration of 1 mm and in concentrations of 0.01, 0.1, 0.5, 1 and 2 mm for 1 h. Experiments were performed four times. Mucin production was detected by a slot blot ELISA assay, using a monoclonal mouse antibody to human MUC5AC mucin. Statistical significance was tested using a one-way analysis of variance. NO donation by ISDN caused a consistent rise in mucin production above control. Maximal mucin production of 35% above control occurred at 1 h with 1 mm ISDN. Mucin production increased from 12% above control with 0.1 mm ISDN dinitrate to 45% above baseline with 2 mm ISDN. NO donation by ISDN results in an increase in mucus production, which is both dose and time related. This adds further evidence to an inflammatory model for mucus secretion in OME.
Insights
Nitric oxide (NO) donation increases mucin production in a model of otitis media with effusion (OME). This finding supports the role of inflammation in mucus secretion during OME.
Area of Science:
- Biochemistry
- Cell Biology
- Otolaryngology
Background:
- Otitis media with effusion (OME) involves middle ear fluid rich in mucins.
- Nitric oxide (NO) is implicated as a mediator in the inflammatory reaction causing OME.
- The HT29-MTX goblet cell line effectively models MUC5AC mucin production relevant to OME.
Purpose of the Study:
- To investigate the effect of nitric oxide (NO) donation on mucin production using the HT29-MTX cell line.
- To determine if NO influences MUC5AC mucin secretion, a key component of middle ear effusions.
Main Methods:
- HT29-MTX cells were cultured and treated with varying concentrations and durations of isosorbide dinitrate (ISDN), a NO donor.
- Mucin production was quantified using a slot blot ELISA assay with an antibody specific to MUC5AC.
- Statistical analysis was performed using one-way ANOVA.
Main Results:
- ISDN-induced NO donation consistently elevated mucin production compared to controls.
- Maximal mucin increase of 35% was observed at 1 hour with 1 mM ISDN.
- Mucin production showed a dose-dependent increase, rising from 12% at 0.1 mM to 45% at 2 mM ISDN.
Conclusions:
- Nitric oxide (NO) donation stimulates mucus production in a dose- and time-dependent manner.
- These findings provide further evidence for an inflammatory model of mucus secretion in OME.
- The study highlights the role of NO in the pathogenesis of middle ear effusion.